Baroque celebration of the end of the Great Plague of Vienna.

Op-art architecture designed for happiness.

The site of Austria's biggest concentration camp now honors its victims.

Ride a dragon train into a world of dwarves.

The world's oldest known salt mine.

This bustling Italian plaza is built on the ruins of an ancient Roman amphitheater.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

A slightly creepy gallery of plaster cast models in the same museum as Michelangelo's David.

Fortified medieval tower house with lovely roof garden.